These guys are really hard on Geese and Song Birds... they find a easy meal on their eggs.... Smart and should be controlled...

Crows are believed to have evolved in central Asia and radiated out into North America, Africa, Europe, and Australia.
Calls
Crows make a wide variety of calls or vocalizations. Crows have also been observed to respond to calls of other species; this behavior is, it is presumed, learned because it varies regionally. Crows' vocalizations are complex and poorly understood. Some of the many vocalizations that crows make are a "Koww", usually echoed back and forth between birds; a series of "Kowws" in discrete units; a long caw followed by a series of short caws (usually made when a bird takes off from a perch); an echo-like "eh-aw" sound; and more. These vocalizations vary by species, and within each species they vary regionally. In many species, the pattern and number of the numerical vocalizations have been observed to change in response to events in the surroundings (i.e. arrival or departure of crows).
Intelligence

As a group, crows show remarkable examples of intelligence. Natural history books from the 18th century recount an often-repeated, but unproven anecdote of "counting crows" — specifically a crow whose ability to count to five (or four in some versions) is established through a logic trap set by a farmer.[8][9] Crows and ravens often score very highly on intelligence tests. Certain species top the avian IQ scale.[10] Wild hooded crows in Israel have learned to use bread crumbs for bait-fishing.[11] Crows will engage in a kind of mid-air jousting, or air-"chicken" to establish pecking order. Crows have been found to engage in feats such as sports,[12] tool use, the ability to hide and store food across seasons, episodic-like memory, and the ability to use individual experience in predicting the behavior of environmental conspecifics.[13]

One species, the New Caledonian Crow, has also been intensively studied recently because of its ability to manufacture and use its own tools in the day-to-day search for food. These tools include "knives" cut from stiff leaves and stiff stalks of grass.[14] Another skill involves dropping tough nuts into a trafficked street and waiting for a car to crush them open.[15][16] On October 5, 2007, researchers from the University of Oxford, England, presented data acquired by mounting tiny video cameras on the tails of New Caledonian Crows. It turned out that they use a larger variety of tools than previously known, plucking, smoothing, and bending twigs and grass stems to procure a variety of foodstuffs.[17][18] Crows in Queensland, Australia, have learned how to eat the toxic cane toad by flipping the cane toad on its back and violently stabbing the throat where the skin is thinner, allowing the crow to access the non-toxic innards; their long beaks ensure that all of the innards can be removed.[19][20]

Crows have demonstrated the ability to distinguish individual humans by recognizing facial features.[21]
Crows are omnivorous, and their diet is very diverse. They will eat almost anything, including other birds, fruits, nuts, mollusks, earthworms, seeds, frogs, eggs, nestlings, mice and carrion. The origin of placing scarecrows in grain fields resulted from the crow’s incessant damaging and scavenging, although crows assist farmers by eating insects otherwise attracted to their crops.[

Crows reach sexual maturity around the age of 3 years for females and 5 years for males. Some crows may live to the age of 20, and the oldest known American crow in the wild was almost 30 years old.[23] The oldest captive crow documented died at age 59.[24]

The American crow is highly susceptible to the recently introduced North American strain of West Nile virus.[25] American crows typically die within one week of acquiring the disease and very few survive exposure.